Hvanadalshnjukur Training

2100 m elevation gain is a long day. Plus the distance. I’d say you need to be equally fit as if you would plan to ascent MontBlanc. Run 10 K two – three times a week, preferably doing it under 1 hour. Good news – no effect of altitude. If you are not in the best shape ever – just plan for a longer day. Say, have 15 hours at your disposal instead of 12 and slowly but surely you will get up and down. If you plan for a longer trip – take head lamps. In winter take head lamps in any case.